Sterilizer



FIG. 1 is a front and right-side perspective view of the sterilizer showing our new design;

FIG. 2 is a bottom, rear, left-side perspective view thereof; and,

FIG. 3 is a front, left-side perspective view thereof with the door half-opened.

The top of the sterilizer forms no part of the claimed design. 

The ornamental design for a sterilizer, as shown and described. 